linux-kernel - [PATCH] vfs: fix uninitialized flags in splice_to

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Date:   Thu, 16 Feb 2017 17:49:02 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH] vfs: fix uninitialized flags in splice_to_pipe()

From: Miklos Szeredi <mszeredi@...hat.com>

Flags (PIPE_BUF_FLAG_PACKET, PIPE_BUF_FLAG_GIFT) could remain on the unused
part of the pipe ring buffer.  Previously splice_to_pipe() left the flags
value alone, which could result in incorrect behavior.

Uninitialized flags appears to have been there from the introduction of the
splice syscall.

Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Cc: <stable@...r.kernel.org> # 2.6.17+
---
 fs/splice.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/splice.c
+++ b/fs/splice.c
@@ -204,6 +204,7 @@ ssize_t splice_to_pipe(struct pipe_inode
 		buf->len = spd->partial[page_nr].len;
 		buf->private = spd->partial[page_nr].private;
 		buf->ops = spd->ops;
+		buf->flags = 0;
 
 		pipe->nrbufs++;
 		page_nr++;